Add libsamplerate support, old resampling is still an option, but this sounds much better for those who need it and don't want to use pulseaudio. Reviewed by shank/avuton.

git-svn-id: https://svn.musicpd.org/mpd/trunk@5316 09075e82-0dd4-0310-85a5-a0d7c8717e4f

doc/mpdconf.example

@@ -123,6 +123,12 @@ error_file                      "~/.mpd/mpd.error"
 #
 #audio_output_format             "44100:16:2"
 #
+# Specifies the libsamplerate converter to use (if compiled in),
+# see man 5 mpd.conf for more information.
+#
+#samplerate_converter <integer or prefix>
+#
+
 ################################################################